Re: [HTCondor-users] proper way to check fo undefined classAd in python

[Stefano Belforte <stefano.belforte@xxxxxxx>]

thanks John. I believe that this is correct for classAd language,
but I suspect somehow the bad syntax managed to work inside python bindings up to
HTCondor 8 as indicated in the post mentioned by Jason
 https://www-auth.cs.wisc.edu/lists/htcondor-users/2021-May/msg00025.shtml
since bot in that and in my case the point is the conversion (or not) to a boolean
inside python of the C++ value.
OTOH, I have no concrete evidence that the code I am trying to fix really worked
in the past, nor am in the mood of installing an older condor version to test.
I am quite happy and confident about what I have now.
Stefano


On 22/06/2022 16:44, John M Knoeller wrote:
> != should never have worked to compare undefined.  So if this used to work in the python bindings that was a bug.
>
> Undefined is not like other values, it cannot be compared using == or !=, it can only be compared using the exact equality (is or =?=)  or exact inequality (isnt or =!=) operators